The answer is a simple radial nervous system.
Echinoderms do not have brains. Around their mouth, they have central rings from which nerves radially run into arms and along the body. Movement is controlled by the branches of those radial nerves.
I think it means that even though the homes/cells may appear di²erent, theyall include the same basic essentials. Thank you for posting your question here at brainly. I hope the answer will help you. Feel free to ask more questions here.
Xylem transports and stores water and water-soluble nutrients.
Phloem transports sugars, proteins, and other organic molecules.
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